Bone anchor



FIG. 1 is a perspective view of a bone anchor, showing our new design;

FIG. 2 is a side elevational view thereof, the opposite side elevationalview being a mirror image thereto;

FIG. 3 is a front elevational view thereof, the opposite sideelevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a bone anchor, as shown and described.